The fact that PvP is forced onto PvE players. All your character development should take place in PvE, PvP should just be for testing your guardian against others. The easiest fix to PvP award system...would be to remove it completely. Crucible marks should stay as they are, but instead of having 100 cap for both Vanguard and Crucible, they should share a common 200 cap so you can play only PvP or only PvE for the marks. This way people who don't like PvP can do their stuff in PvE and the ones who can't stand Tiger strikes can do it in Crucible. I can relate to both. One Hit Kill potential is a little bit too big (Melee, Shotgun, Fusion Rifle, Sniper, Rocket Launcher, Super) and this decreases the gunplay effect of the game. I think Halo 4 had a much better balance in guns vs other attacks.